Process of making camphor.



UNITED STATES PATENT .OFFI E.

JERSEY, ASSIGNOR TO V E RONA (HEM ICA L (OM PAXY,

OF NEWARK, NEW JERSEY, A CORPORATION OF NElV JERSEY.

PROCESS or MAKING caMPnon.

Specification of Letters Patent.

Patented Sept. 16, 1908.

Original application filed July 2, 1907, Serial No. 381,835. Divided and this application filed December 27, 1907- Serial No. 408,331.

To all whom it may concern: V

Be it known that I AuoLPn WAcK, a sub- 'ect of the Emperor of Germany, residing at 'ture of camphor therein referred to was reserved for another' application. The present application is made to claim such manufacturoof camphor.

' are not employed.

ing the result.

solved material Now, I have discovered that when certain substances, which are primary aromatic amino substances inclusive of their salts their sulfo-acids and salts thereof, are mixed with the material to be oxidized to form cam hor the amount of the latter which is pro uced upon oxidation of the mixture is greater than when such primary aromatic amino substances (hereinafter generically termed prim'ary aromatic amino substances)v Among the rimary. aromatic amino substances which i have employed in the'prac-' tics of this, my invention are: anlin; anilin sulfo acid, particularly the; para-variet thereof; .naphthylamin, particu arly the a pha-varietythereof and naphthylaniin sulfo acid particularly the 1.naphthylaminA.sulfo acid variety thereof. These may be em ployedeas free base, free acid or salt of base or salt of acid without materially affect- The oxidizing agents which have been found to be most favorably influenced thereby are the acid oxidizing agents and particularly such as produce no undisin the course of their action and more particularly sodium bichromat e and' sulfuric acid or chromic acid and acetic of their well-known equivalents of oxidation or such as involve the use of,

ozone also have the percentage amount of aromatic carbonyl derivative produced by a hour,

them favorably affected by the addition of the aforementioned aromatic amino-substance to the'material to be oxidized. i

The initial material to be oxidized into camphor may be of any of the materials suit-' able for the production of camphor such as,

a for example, borneol, inclusive of its esters especially its acetic acid esters, iso-borneo'li inclusive of its esters especially its acetic aci ester all of which are hereinafter generically referred to as borneol compound.

The following example will serve as a prac tical illustration of a way in which rny invention may be practiced but I, of course, do

not regard my invention as limited to the exact quantities, proportions or conditions set forth since these may be varied within wide limits without departi from my invent-ion and because the favorab e influence of my invention is discernible in all ordinary condi tions of proportion, quantities and strengths.

T he parts are by weight:

Preparation of camplz0r.Dissolve fifty (50) parts of isoborneol in one hundred (100) parts of benzol; intimately-mix therewith a solution of fifteen (15) parts of 'sulfanilic acid in five hundred (500) arts of water: heat this mixture in a vesse provided with areturri condenser to the boiling point of the benzol and while stirring the mixture thoroughly add continuously a-mixture made up of one hundred -(l00) parts of sodium bichromate two hundred (200) parts of water and one hundred (100) parts of sulfuric acid of ninety-live per cent. (95%) 11,80, in such a manner that this addition requires but one then continue the heating for about ten minutes longer then separate and remove the benzol layer; remove the benzol b suitable distillation; the residue is the esired product; In practice in this manner forty; nine (49) arts of camphor have been 0 tained and which without further purification possesses a melting point of one hundred and seventy-five (175) to one hundred and seventy-six (176) degrees centigrade.

Now what I claim is:

1.-The improvement in the manufacture of camphor which consists in submitting a mixture containing a borne ol compound'and r a herc inbcfore defined prlmary aromatic my hand in the presence of two subscn'hing amino substance to oxidation. f 'wltnesses.

2. The improvement in the mam! nature of Lamphor which consists in suhrnjttip a ADOLPH WACK' 5 mixture of isoborneol and sulfamhc am to wltnesses;

JOHN A. YOUNG,

oxidation.

In testimony whereof I have hereunto set JOHN J. CONNEL'L. 

